How to link object.rotations to mouse.movements?

Hi guys, here u are my goal:

I have this cannon and I want to control its rotation on x axis moving the mouse up & down. But since I can't do that I decide to post here.

I am actually using a script that control the movement (with rotation limits processed by clamp method) pressing up arrow and down arrow.

But I would like to add the mouse function too.

Which is the best way?

Please answer in C# and if possible be clearer as u can because I am a true beginner. :(

If can help, the script I am using to rotate with arrows and limit the rotation of the cannon is the follow:

     using UnityEngine;
     using System.Collections;
      
     public class ClampingRotation : MonoBehaviour
     {
     public float ySpeed = 250.0f;
      
     public float yMinLimit = -80f;
     public float yMaxLimit = 80f;
      
     private float x = 0.0f;
     private float y = 0.0f;
     private float z = 0.0f;
      
     void Start()
     {
     x = transform.eulerAngles.x;
     y = transform.eulerAngles.y;
     z = transform.eulerAngles.z;
     }
      
     void Update()
     {
     if ( Input.GetKey(KeyCode.UpArrow) )
     {
     y += ySpeed * Time.deltaTime;
     }
      
     if ( Input.GetKey(KeyCode.DownArrow) )
     {
     y -= ySpeed * Time.deltaTime;
     }
      
     y = ClampAngle( y, yMinLimit, yMaxLimit );
      
     Quaternion newRot = Quaternion.Euler( x, y, z );
      
     transform.rotation = newRot;
     }
      
     float ClampAngle( float angle, float min, float max )
     {
     if ( angle < -360 )
     angle += 360;
     if ( angle > 360 )
     angle -= 360;
      
     return Mathf.Clamp( angle, min, max );
     }
     }

best regards to you all guys and I hope to hear from you soon!

Bye

Matthew